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31 March 2010 Life cycle structural health monitoring of airframe structures by strain mapping using FBG sensors
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Abstract
The purpose of this research is to develop the structural health monitoring system for composite airframe structures by strain mapping through their life cycles. We apply FBG sensor networks to CFRP pressure bulkheads and monitor the strain through their life cycles: molding, processing, assembly, operation and maintenance. Damages, defects and deformations which occurred in each stage are detected using the strain distribution. At first, we monitored the strain of CFRP laminates during molding and processing with FBG sensors. As a result, not only the thermal strain on curing process but also strain change due to demolding was measured precisely. In addition, we analyzed the change in strain distribution due to damages of CFRP pressure bulkhead such as stringer debonding and impact damage of skin under operational load in flight. On the basis of these results, the location of FBG sensors suitable for the detection of damages was determined.
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I. Takahashi, K. Sekine, H. Takeya, Y. Iwahori, N. Takeda, and Y. Koshioka "Life cycle structural health monitoring of airframe structures by strain mapping using FBG sensors", Proc. SPIE 7647, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2010, 764723 (31 March 2010); https://doi.org/10.1117/12.847262
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